Final answer:
The variable not depicted on a meteorological station model is ultraviolet radiation; station models usually include wind speed and direction, temperature, and cloud cover.
Step-by-step explanation:
The variable not depicted on a station model used in meteorology is ultraviolet radiation. Station models are compact diagrams that display a variety of meteorological measurements at specific locations, including wind speed and direction, temperature, and cloud cover. These models help meteorologists to quickly analyze weather patterns and make forecasts. Ultraviolet (UV) radiation levels are not typically included in station models.